genealogical adj.

early 14c., "line of descent, pedigree, descent," from Old French genealogie (12c.), from Late Latin genealogia "tracing of a family," from Greek genealogia "the making of a pedigree," from genea "generation, descent" (from PIE root *gene- "give birth, beget," with derivatives referring to procreation and familial and tribal groups) + -logia (see -logy). An Old English word for it was folctalu, literally "folk tale." Meaning "study of family trees" is from 1768.

suffix forming adjectives from nouns or other adjectives, "of, like, related to, pertaining to," Middle English -al, -el, from French or directly from Latin -alis (see -al (2)).